Steam boiler and method of making the same



W. E. CLEVELAND. STEAM BOILER AND METHOD OF MAKING THE SAME. APPLICATION FILED SEPT127, 1919.

Patented June 20, 1922.

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STM BOILER AND METHUD OF MAKING SAME.

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v Specification of Letters Patent.

Patented June 2@,

Application, filed se temb'ef 27, 1919. seria no. aamoa To all whom it may concern! I Be it known that l, WILLIAM E. CLEVE- LA-ND, a citizen of the United States, residing at Medford, in the county of Middlesex and State of Massachusetts, haveinvented certain new and useful Improvements in Steam Boilers and Methods of Making the Same and I do hereby declare the following to be a full, clear, and exact description of the invention such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to the manufacture of steam boilers and more particularly to steel fire-tube boilersfor steam automobile engines and methods of making the same.

The primary object of the present invention is to provide a novel and improved Fig. 2ris an enlarged vertical sectional'view of, the lower end of a stillening rod and a ppartion of the bottom head of the boiler to w ich the rod is secured; Fig. 3 is an en larged vertical sectional view of the lower end of one of the fire-tubes and a portion of the bottom head of the boiler to which the tube is secured; Fig.4 is a view similar to Fig. 3 but with'the bottom head shown before the fire-tubes are applied; Fig. 5 1s a similar view showing a fire-tube applied but without being secured in place; and Fig.

6 is a sectional plan view taken on the line 6-6 of Fig. 5. v a

The boi er illustrated" in the drawings comprises a seamless cylindrical shell 2 of steel which is reenforced by suitable reenforcing bands 4. The ends of the shell are closed by top and bottom heads 6 and 8, re-

spectively, comprising circular plates having peripheral flanges, 10 which closely fit over and are welded to theendsof the shell. The flanges 10 are also welded tov the reenforcing bands 4 located adjacent the outer ends of the shell as indicated in Figs. I and 3. The outer edges of the ends of the shell are bevelled to provide annular spaces 12 between the ends of the shell and the heads. The lower end of the shell is provided with a plurality of transverse radial slots 14 leading from the space 12. I

The heads are connected by fire-tubes 16 of the usual construction, the ends of which tubes extend through apertures in the heads The apertures in the top head throughout thelr length are of the same diameter as the tubes, while the apertures in the bottom head have a cylindrical lower portion 18 of the same diameter as the tubes, and anienlarged cylindrical upper portion 20, the upper end of which is countersunk or flares outwardly. The lower ends of the tubes are flared slightly and the tubes are inserted through the apertures in the bottom head after this head is applied to the shell but before the top head is applied (Fig. 5), the tubes then being held in position by any sultable means as by a jig engaging their upper ends.- Ferrules 21 of the usual constructlon may be applied to the, lower ends of the tubes. The bottom head is then heated to approximately 1700 degrees Fahrenw heit, whereupon a suitable welding or brazing material in a molten state is poured upon the inside surface of the bottomhead. This brazing material is supplied in sufiicient quantity to fill the spaces between the upper portions of the walls of the apertures and the tubes, and to flow through the slots'14 to fill the annular space 12; By this method it will be seen that the brazing material surrounds the tubes well down 1nto the apertures,so that when the brazing material solidifies, the tubes are uniformly and effectively sealed andsecurely held in the apertures; Moreover, the lodgem'ent of the brazing material in the annular space 12 provides a uniformly, tight joint between the lower end of the shell and the bottom head 8.

-VVhen the brazing material has become thoroughly set, the top head is welded upon the upper end of the shell and the upper ends ofthe tubes are welded or swaged over in the usual manner. 7

The top and bottom heads are provided with central apertures 24 (Fig. 2), having an enlarged outer portion which flares outwardly. The aperturesreceive the ends of ,a stiffening rod 26 having an annular groove 28. at each end. After the stifieningrod .boiler which comprises forming a cylinis applied, it is secured in place by means plate having a plurality of apertures there-' of welding material which is caused tofill in and having'an annular flange engaging the space between 'the ends of the rod and the cylindrical wall of the shell, fire-tubes the outer portion of the wallskof the aperhaving one end inserted in the apertures in tures, and then the extreme ends of the rod the plate, and brazingmaterial applied to are headed-oven This manner of securing the inner surface of the head and in the the stiffening rod to the heads provides a space between the bevelled edge of theshell tigilit and strong joint. l and the head.

aving thus described the 3. A fire-tube boiler having, in combinawhat is claimed is: a

1. The method ofconstructing a firetube invention,

edge of one. end thereof bevelled and having a transverse slot in said end, a' head closdrical shell, bevelling the outer edge of one ing said end of the shell comprising a plate end of the shell, forming a transverse slot having a plurality. of apertures therein and in said end of the shell, closing said end of having an annular flange engaging the the shell by meansof a head comprising-a cylindrical wall of theshell, fire-tubes havplate having an annular flange engaging the ing one end inserted in the apertures, and cylindrical wall of the shell, forming a plubrazing material applied to the inner surrality of apertures in the head to receive face ojithe head to seal the joint between the the ends of the fire tubes, inserting one end fire-tubes and said plate and to seal the of the fire tubes in the apertures, and applyjoint between the shell and the head.

ing brazing material to the inner surface 4. A fire tube boiler having, in combinaof the head so that it will flow through said tion, a shell provided with a head having slot in the end of the shell and into the a series of apertures therein having their space between said bevelled outer edge of inner portions countersunk, fire tubes havthe end of the shell and the bottom head ing one end inserted in the apertures, and and flow about the tubes so as to seal the brazing materialapplied to the inner surjoin'ts between the tubes and head. face of the head and filling the space hetion, a cylindrical shell having the outer,

2. A fire-tubeboiler having, in combina tween the walls of the countersunk p013 tion, a cylindrical shell having the outer tions of the apertures and the fire tubes tof i edge of one end thereof bevelled, a head secure the tubes to the head.

closing said end of the shell comprising 3. WILLIAM E. CLEVELAND; 

